Merge pull request #12998 from SORMAS-Foundation/#12983-Exposure_data_tab_has_error_when_edit_or_save

#12983 - Exposure data tab has error when edit/save

Author: MateStrysewske

sormas-ui/src/main/java/de/symeda/sormas/ui/exposure/ExposuresField.java

@@ -226,8 +226,9 @@ private void addGeneratedColumns(Table table) {
 
 		table.addGeneratedColumn(COLUMN_SOURCE_CASE_NAME, (Table.ColumnGenerator) (source, itemId, columnId) -> {
 			ExposureDto exposure = (ExposureDto) itemId;
+			ContactReferenceDto contactToCase = exposure.getContactToCase();
 			return !isPseudonymized
-				? DataHelper.toStringNullable(getContactCaseName(exposure.getContactToCase()))
+				? DataHelper.toStringNullable(contactToCase != null ? getContactCaseName(contactToCase) : null)
 				: I18nProperties.getCaption(Captions.inaccessibleValue);
 		});
 	}